Thread: heater won't blow hot air

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  1. #1 heater won't blow hot air 
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    2008 - I can't get hot air to blow from the heater. I changed the thermostat. I've checked the hoses to see if one if one if cold, however both feel warm so don't think there's a clog. Suggestions?
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  2. #2 Re: heater won't blow hot air 
    I live here. MoarkatsINmuhtrailer's Avatar
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    Heater core could be clogged. What thermostat did you put in? Regular 1 year Stant or the superstat lifetime?
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  3. #3 Re: heater won't blow hot air 
    GTX Level Member Bills1997GTP's Avatar
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    How hot does the car get? Cause I know my 04 won't blow hot air until it reaches half way, also check coolant levels .


    Sent from my iPhone
    2004 Grand Prix GTP 150,000 " The New Edition "
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  4. #4 Re: heater won't blow hot air 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Back flush the heater core.

    SMGPFC Member #1
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  5. #5 Re: heater won't blow hot air 
    Moderator dsmuts's Avatar
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    mine blows heat when it just starts to register on the temp gauge.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  6. #6 Re: heater won't blow hot air 
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    If both heater hoses are warm then there is good flow through the heater core. Your problem is inside the car, check the temp door actuator and knob
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  7. #7 Re: heater won't blow hot air 
    I live here. MoarkatsINmuhtrailer's Avatar
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    He said the radiator hoses. Not the heater hoses
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  8. #8 Re: heater won't blow hot air 
    Perma-Banned! JK LOL Explicit_Spade's Avatar
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    OP, Post back! We miss you!
    Quote Originally Posted by W-Body Store
    Remember, GM engineers didn't take into account your need for speed.
    Daily Driver: 06 Grand Prix GT / 9.4:1 CR / IS3 Heads / Ported Gen V / ZZP Headers / HPT Pro / Pulleys: 4.25, 3.8, 3.5, 3.4, 3.2, 3.0, 2.9, 2.7
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